What are the practical uses of voltage divider?
A typical voltage divider as the picture (I've attached) shows has two resistors, R1 and R2. However, if we put a load on Vout, the original R2 has become a parallel circuit with a different equivalent resistance than R2. So, if the ratio of voltage applied to the load is still depend on the load's resistance, why do we need R2 (or a voltage divider)? Why don't we just simply use the adequate R1 according to the load's resistance to supply the voltage we want? And by this way, we can save energy by not using R2.
A typical voltage divider as the picture (I've attached) shows has two resistors, R1 and R2. However, if we put a load on Vout, the original R2 has become a parallel circuit with a different equivalent resistance than R2. So, if the ratio of voltage applied to the load is still depend on the load's resistance, why do we need R2 (or a voltage divider)? Why don't we just simply use the adequate R1 according to the load's resistance to supply the voltage we want? And by this way, we can save energy by not using R2.
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